FIR: Support DEBUG_INFO_EXPRESSION_TYPE

compiler/fir/analysis-tests/testData/resolve/callResolution/debugExpressionType.kt

@@ -0,0 +1,9 @@
+fun foo(
+    x1: String,
+    x2: Collection<CharSequence>,
+    x3: MutableMap<out CharSequence, in MutableList<*>>
+) {
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.String")!>x1<!>
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.collections.Collection<kotlin.CharSequence>")!>x2<!>
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.collections.MutableMap<out kotlin.CharSequence, in kotlin.collections.MutableList<*>>")!>x3<!>
+}

compiler/fir/analysis-tests/testData/resolve/callResolution/debugExpressionType.txt

@@ -0,0 +1,6 @@
+FILE: debugExpressionType.kt
+    public final fun foo(x1: R|kotlin/String|, x2: R|kotlin/collections/Collection<kotlin/CharSequence>|, x3: R|kotlin/collections/MutableMap<out kotlin/CharSequence, in kotlin/collections/MutableList<*>>|): R|kotlin/Unit| {
+        R|<local>/x1|
+        R|<local>/x2|
+        R|<local>/x3|
+    }

compiler/fir/analysis-tests/tests/org/jetbrains/kotlin/fir/FirDiagnosticsTestGenerated.java

@@ -584,6 +584,11 @@ public class FirDiagnosticsTestGenerated extends AbstractFirDiagnosticsTest {
             runTest("compiler/fir/analysis-tests/testData/resolve/callResolution/companionInvoke.kt");
         }
 
+        @TestMetadata("debugExpressionType.kt")
+        public void testDebugExpressionType() throws Exception {
+            runTest("compiler/fir/analysis-tests/testData/resolve/callResolution/debugExpressionType.kt");
+        }
+
         @TestMetadata("debugInfoCall.kt")
         public void testDebugInfoCall() throws Exception {
             runTest("compiler/fir/analysis-tests/testData/resolve/callResolution/debugInfoCall.kt");

compiler/fir/analysis-tests/tests/org/jetbrains/kotlin/fir/FirDiagnosticsWithLightTreeTestGenerated.java

@@ -584,6 +584,11 @@ public class FirDiagnosticsWithLightTreeTestGenerated extends AbstractFirDiagnos
             runTest("compiler/fir/analysis-tests/testData/resolve/callResolution/companionInvoke.kt");
         }
 
+        @TestMetadata("debugExpressionType.kt")
+        public void testDebugExpressionType() throws Exception {
+            runTest("compiler/fir/analysis-tests/testData/resolve/callResolution/debugExpressionType.kt");
+        }
+
         @TestMetadata("debugInfoCall.kt")
         public void testDebugInfoCall() throws Exception {
             runTest("compiler/fir/analysis-tests/testData/resolve/callResolution/debugInfoCall.kt");

compiler/tests-common/tests/org/jetbrains/kotlin/fir/AbstractFirDiagnosticTest.kt

@@ -17,6 +17,8 @@ import org.jetbrains.kotlin.fir.declarations.FirCallableMemberDeclaration
 import org.jetbrains.kotlin.fir.declarations.FirFile
 import org.jetbrains.kotlin.fir.declarations.FirFunction
 import org.jetbrains.kotlin.fir.declarations.FirProperty
+import org.jetbrains.kotlin.fir.expressions.FirExpression
+import org.jetbrains.kotlin.fir.expressions.FirExpressionWithSmartcast
 import org.jetbrains.kotlin.fir.expressions.FirFunctionCall
 import org.jetbrains.kotlin.fir.references.FirControlFlowGraphReference
 import org.jetbrains.kotlin.fir.references.FirNamedReference
@@ -31,6 +33,9 @@ import org.jetbrains.kotlin.fir.symbols.AbstractFirBasedSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirClassLikeSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
+import org.jetbrains.kotlin.fir.types.ConeKotlinType
+import org.jetbrains.kotlin.fir.types.FirTypeRef
+import org.jetbrains.kotlin.fir.types.coneTypeSafe
 import org.jetbrains.kotlin.fir.visitors.FirDefaultVisitorVoid
 import org.jetbrains.kotlin.fir.visitors.FirVisitorVoid
 import org.jetbrains.kotlin.name.FqNameUnsafe
@@ -124,6 +129,14 @@ abstract class AbstractFirDiagnosticsTest : AbstractFirBaseDiagnosticsTest() {
 
         object : FirDefaultVisitorVoid() {
             override fun visitElement(element: FirElement) {
+                if (element is FirExpression) {
+                    result.addIfNotNull(
+                        createExpressionTypeDiagnosticIfExpected(
+                            element, diagnosedRangesToDiagnosticNames
+                        )
+                    )
+                }
+
                 element.acceptChildren(this)
             }
 
@@ -139,46 +152,67 @@ abstract class AbstractFirDiagnosticsTest : AbstractFirBaseDiagnosticsTest() {
         return result
     }
 
-    fun createCallDiagnosticIfExpected(
+    fun createExpressionTypeDiagnosticIfExpected(
+        element: FirExpression,
+        diagnosedRangesToDiagnosticNames: MutableMap<IntRange, MutableSet<String>>
+    ): FirDiagnosticWithParameters1<FirSourceElement, String>? =
+        DebugInfoDiagnosticFactory1.EXPRESSION_TYPE.createDebugInfoDiagnostic(element, diagnosedRangesToDiagnosticNames) {
+            element.typeRef.renderAsString((element as? FirExpressionWithSmartcast)?.originalType)
+        }
+
+    private fun FirTypeRef.renderAsString(originalTypeRef: FirTypeRef?): String {
+        val type = coneTypeSafe<ConeKotlinType>() ?: return "Type is unknown"
+        val rendered = type.renderForDebugInfo()
+        val originalTypeRendered = originalTypeRef?.coneTypeSafe<ConeKotlinType>()?.renderForDebugInfo() ?: return rendered
+
+        return "$rendered & $originalTypeRendered"
+    }
+
+    private fun createCallDiagnosticIfExpected(
         element: FirElement,
         reference: FirNamedReference,
         diagnosedRangesToDiagnosticNames: MutableMap<IntRange, MutableSet<String>>
+    ): FirDiagnosticWithParameters1<FirSourceElement, String>? =
+        DebugInfoDiagnosticFactory1.CALL.createDebugInfoDiagnostic(element, diagnosedRangesToDiagnosticNames) {
+
+            val resolvedSymbol = (reference as? FirResolvedNamedReference)?.resolvedSymbol
+            val fqName = resolvedSymbol?.fqNameUnsafe()
+            Renderers.renderCallInfo(fqName, getTypeOfCall(reference, resolvedSymbol))
+        }
+
+    private fun DebugInfoDiagnosticFactory1.createDebugInfoDiagnostic(
+        element: FirElement,
+        diagnosedRangesToDiagnosticNames: MutableMap<IntRange, MutableSet<String>>,
+        argument: () -> String,
     ): FirDiagnosticWithParameters1<FirSourceElement, String>? {
-        val resolvedSymbol = (reference as? FirResolvedNamedReference)?.resolvedSymbol
         val sourceElement = element.source ?: return null
+        if (diagnosedRangesToDiagnosticNames[sourceElement.startOffset..sourceElement.endOffset]?.contains(this.name) != true) return null
 
-        val factory = DebugInfoDiagnosticFactory1.CALL
-        if (diagnosedRangesToDiagnosticNames[sourceElement.startOffset..sourceElement.endOffset]?.contains(factory.name) != true) return null
-
-        val fqName = resolvedSymbol?.fqNameUnsafe()
-
-        val argument = Renderers.renderCallInfo(fqName, getTypeOfCall(reference, resolvedSymbol))
-
+        val argumentText = argument()
         return when (sourceElement) {
             is FirPsiSourceElement<*> -> FirPsiDiagnosticWithParameters1(
                 sourceElement,
-                argument,
-                factory.severity,
+                argumentText,
+                severity,
                 FirDiagnosticFactory1(
-                    factory.name,
-                    factory.severity,
-                    factory
+                    name,
+                    severity,
+                    this
                 )
             )
             is FirLightSourceElement -> FirLightDiagnosticWithParameters1(
                 sourceElement,
-                argument,
-                factory.severity,
+                argumentText,
+                severity,
                 FirDiagnosticFactory1<FirSourceElement, PsiElement, String>(
-                    factory.name,
-                    factory.severity,
-                    factory
+                    name,
+                    severity,
+                    this
                 )
             )
         }
     }
 
-
     private fun AbstractFirBasedSymbol<*>.fqNameUnsafe(): FqNameUnsafe? = when (this) {
         is FirClassLikeSymbol<*> -> classId.asSingleFqName().toUnsafe()
         is FirCallableSymbol<*> -> callableId.asFqName().toUnsafe()

compiler/tests-common/tests/org/jetbrains/kotlin/fir/RenderingForDebugInfo.kt

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir
+
+import org.jetbrains.kotlin.fir.types.*
+
+fun ConeKotlinType.renderForDebugInfo(): String {
+    val nullabilitySuffix = if (this !is ConeKotlinErrorType && this !is ConeClassErrorType) nullability.suffix else ""
+    return when (this) {
+        is ConeTypeVariableType -> "TypeVariable(${this.lookupTag.name})"
+        is ConeDefinitelyNotNullType -> "${original.renderForDebugInfo()}!!"
+        is ConeClassErrorType -> "ERROR CLASS: $reason"
+        is ConeCapturedType -> "CapturedType(${constructor.projection.renderForDebugInfo()})"
+        is ConeClassLikeType -> {
+            buildString {
+                append(lookupTag.classId.asSingleFqName().asString())
+                if (typeArguments.isNotEmpty()) {
+                    append(typeArguments.joinToString(prefix = "<", postfix = ">") {
+                        it.renderForDebugInfo()
+                    })
+                }
+            }
+        }
+        is ConeLookupTagBasedType -> {
+            lookupTag.name.asString()
+        }
+        is ConeFlexibleType -> {
+            buildString {
+                append(lowerBound.renderForDebugInfo())
+                append("..")
+                append(upperBound.renderForDebugInfo())
+            }
+        }
+        is ConeIntersectionType -> {
+            intersectedTypes.joinToString(
+                separator = " & ",
+            ) { it.renderForDebugInfo() }
+        }
+        is ConeStubType -> "Stub: $variable"
+        is ConeIntegerLiteralType -> "ILT: $value"
+    } + nullabilitySuffix
+}
+
+private fun ConeTypeProjection.renderForDebugInfo(): String {
+    return when (this) {
+        ConeStarProjection -> "*"
+        is ConeKotlinTypeProjectionIn -> "in ${type.renderForDebugInfo()}"
+        is ConeKotlinTypeProjectionOut -> "out ${type.renderForDebugInfo()}"
+        is ConeKotlinType -> renderForDebugInfo()
+    }
+}